// page/shangping/shangping.js
Page({

    /**
     * 页面的初始数据
     */
    data: {
        baseURL:wx.baseURL,
        total:0,
        rows:[],
        brandSelected:{},//已选品牌
        brands:[],
        brandVisible:false,
        query:{
            key:'',//搜索关键字
            brandIds:'',
            sorted:0,
            pageNum:1,
            pageSize:10
        }
    },
    //清空选择的状态
    clearBrand(){
        this.setData({
            brandSelected:{}
        })
    },
    //按品牌进行搜索
    confimBrand(){
        let brandIds = []
        for(let key in this.data.brandSelected){//取出选中的品牌id
            if(key && this.data.brandSelected[key]) brandIds.push(key)
        }
        this.data.query.brandIds = brandIds.join(',')
        this.refresh(()=>{
            this.setData({
                brandVisible:false
            })
        })
    },
    //切换品牌选择状态
    changeBrand(e){
        let brandSelected = this.data.brandSelected
        let id = e.currentTarget.dataset.id
        brandSelected[id] = !brandSelected[id] //取反 切换选中状态
        this.setData({
            brandSelected
        })
    },
    //切换品牌弹框
    changeBrandVisible(){
        let brandSelected = {}
        if(!this.data.brandVisible && this.data.query.brandIds){//打开品牌弹框
            //按上一次选择结果初始化已选中品牌
            let brandIds = this.data.query.brandIds.split(',')
            for(let i = 0; i < brandIds.length; i++){
                brandSelected[brandIds[i]] = true
            }
        }
        this.setData({
            brandVisible:!this.data.brandVisible,
            brandSelected
        })
    },
    //输入搜索关键字
    inputKey(e){
        this.data.query.key = e.detail.value
    },
    //修改排序方式
    changeSorted(e){
        let sorted = e.currentTarget.dataset.sorted
        this.setData({
            'query.sorted':sorted
        })
        //刷新
        this.refresh()
    },
    //重新加载
    refresh(next){
        this.data.query.pageNum = 1
        this.data.rows = []
        this.data.total = 0
        this.getList(next)
    },
    datail:function(e){
        wx.navigateTo({
          url: '/page/xiangqing/xiangqing?productId=' + e.currentTarget.dataset.id,
        })
    },

    return:function(e){
        wx.navigateBack({
          delta: 1,
        })
    },
    //获取品牌列表
    getBrands(){
        wx.get('http://localhost:3000/wx/brands').then(res => {
            this.setData({
                brands:res
            })
        })
    },
    /**
     * 生命周期函数--监听页面加载
     */
    onLoad: function (options) {
        console.log(options)
        this.setData({
            'query.key':options.key || '',
            'query.brandIds':options.brandIds || ''
        })
        this.getBrands()
        this.getList()
    },

    /**
     * 生命周期函数--监听页面初次渲染完成
     */
    getList(next){
        wx.get('/products',this.data.query).then(res => {
            console.log(res)
            res.rows.forEach((item,index) => {
                item.img = wx.baseURL + item.productImgs.split(',')[0]
            })
            this.setData({
                total:res.total,
                rows:this.data.rows.concat(res.rows),
            })
            if(typeof next == 'function') next()
        })
    },
    onReady: function () {

    },

    /**
     * 生命周期函数--监听页面显示
     */
    onShow: function () {

    },

    /**
     * 生命周期函数--监听页面隐藏
     */
    onHide: function () {

    },

    /**
     * 生命周期函数--监听页面卸载
     */
    onUnload: function () {

    },

    /**
     * 页面相关事件处理函数--监听用户下拉动作
     */
    onPullDownRefresh: function () {
        this.refresh(()=>{
            wx.stopPullDownRefresh()
        })
    },

    /**
     * 页面上拉触底事件的处理函数
     */
    onReachBottom: function () {
        this.data.query.pageNum ++
        if(this.data.rows.length < this.data.total) this.getList()
    },

    /**
     * 用户点击右上角分享
     */
    onShareAppMessage: function () {

    }
})